I'd investigate the CMOS version of the 555.

If you are in the US could you get by with 60 Hz or 120Hz from the power
line? If you are in a country with 50Hz power you could get 50/100Hz from
mains.

Does your source need to be as accurate as a crystal?

Care to use a PIC outputting 100Hz to clock your PIC? ;-)

-Rob

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John Pearson
> Sent: Friday, November 17, 2000 2:12 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Cheap and easy 100 Hz MPU clock?
>
>
> I am looking for a cheap and easy 100 Hz clock (yes, 100
> cycles per second)
> for externally clocking a pic. I considered a 3909, but they
> are not very
> cheap and not that easy to find.
>
> Any ideas?
>
> Thanks
>
> John
>
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